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  #16  
Old 12-15-2010, 07:05 PM
bob91343 bob91343 is offline
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I wonder if this is a taut band or pivot suspension. The meter is still usable as long as I stay away from the ends of the scale.
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  #17  
Old 12-15-2010, 07:52 PM
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Quote:
Originally Posted by bob91343 View Post
I wonder if this is a taut band or pivot suspension. The meter is still usable as long as I stay away from the ends of the scale.
My 630-NA appears to be a taut band...I can clearly see a u shaped spring that tensions a support wire that passes through hole in a white center insulator. Are the little white travel limit "bumpers" on yours possibly interfering with the needle travel?

jr
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  #18  
Old 12-15-2010, 11:39 PM
bob91343 bob91343 is offline
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The needle travel isn't restricted. If it's on zero, I can tap the front and it will gently swing over to the stop. If it's at full scale for a moment, it will start to drift up to the top stop. If I reduce the meter current, the needle starts down and overshoots the full scale mark. It just won't stay on full scale or on zero. Well, it will stay on zero more often than not but I have to tap the meter sometimes for it to do that. When I tap it, it moves smoothly. Better than tapping is to move the entire meter so the pointer's inertia moves it.
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  #19  
Old 12-26-2010, 01:51 PM
julianburke julianburke is offline
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I still have a small quantity of small pocket VOM's still NOS in the original unopened mil-spec box that the military bought back in 1989. Battery supplied with it is no good (packed separately-no damage) but still a good little meter. Whoever the original OEM was, sold them in the past under many different names. Anyone remember these?
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  #20  
Old 07-25-2011, 01:03 PM
OLJOE OLJOE is offline
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Triplett 310 type 3....
I am trying to find a source that has the fuse for this type 3. Have tried:
Radio Shack, auto stores, various electronic outlets, Triplett etc. without
luck. I have a total of 7 310's, 2 are disabled because of this missing fuse.
the fuse is:
1/8 amp 8AG,MKB or equivalent
of course the ohms positions won't work because of this missing fuse. All
other ranges work fine.

Does anybody know where I can get these fuses. Even the location of
this fuse is different than what is shown in the 310 manual. Both of
mine that need the fuse have the fuse located UNDER the 1.5v battery
not in the "out in the open" location shown in the 310 manual.

OLJOE
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  #21  
Old 07-25-2011, 06:12 PM
julianburke julianburke is offline
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OLJOE, I got 'em. 8AG @ 1/8 amp in NOS Littelfuse pkg of 5. How many do you want? Julian

julianb@charter.net
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  #22  
Old 08-14-2020, 04:04 PM
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Had an inquiry about battery substitute for the 7 volt battery used in the FET 310 model. Mine came with, and seems to be working nicely with a 6 volt lithium battery, K28L. The 310 contacts were bent slightly and a foam spacer was added to assure a tight fit. The 1.5 volt cell is a fairly common typr N.

Here is the schematic and parts layout and parts list:








Hope this helps,

jr
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  #23  
Old 08-14-2020, 07:02 PM
Vintage Dave Vintage Dave is offline
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Thank you, jr!
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  #24  
Old 08-15-2020, 05:52 PM
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DavGoodlin DavGoodlin is offline
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Thanks for a great introduction to a fine VOM Jr tech. My HS Vocational Tech School had these and the EICO 232 VTVMs for the shop benches. We were also schooled on how they loaded both transistor and tube circuits.

Before DMM's of course, the Triplett 630s were 9-10 years old then, yet there seemed to be very little evidence of wear or troubles. I will look for one at a swap meet!
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